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Washing solar panels when hot

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11 hours ago, GlennWest said:

When I wash roof panels will get wet. Is their any chance of them cracking from being hot and water hitting them?

   Yes, there's probably SOME chance, they can get pretty hot in bright sunlight, never say never, thermal expansion and contraction versus Delta T exists, but I can ONLY say I've never read warnings about what you asked...I worry more about HAIL, rocks walnuts or other falling objects..

 Maybe some solar panel or materials expert (thats NOT me) has the answer or someone may google it, its above my pay grade lol

 John T

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I would expect about the same results as washing a car and windows in hot weather and  bright sun.  If you're concerned, spray a light mist on the roof first, the evaporation should cool them some. That's what I do when washing vehicles in the sun.


2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country.  John F. Kennedy 20 Jan 1961


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I just Googled and there are many articles.  Here is one excerpt:  "Pick a cool, cloudy day to wash solar panels, just as you would for washing windows. When it's hot, water evaporates too quickly and leaves residue. Solar panels don't like sudden changes in temperatures and by applying cold water to them on a hot day, you risk cracking them."

Full-timed for 16 Years
Traveled 8 yr in a 2004 Newmar Dutch Star 40' Motorhome
and 8 yr in a 33' Travel Supreme 5th Wheel

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Whenever I wash the panels, I try to do it first thing in the morning or late in the day (either before the panels heat up or after they have cooled down some).  I don’t do it because I am concerned about them cracking though.  I do it because when they are hot, whatever I am spraying on them to clean them evaporates too quickly and leaves streaks.

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